<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数"
        type="warning"
        v-bind:closable="false"
        show-icon
      >
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>

          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- Tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数按钮 -->
          <el-button type="primary" size="mini" v-bind:disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>

            <!-- 展开列 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template> 
            </el-table-column>

            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性按钮 -->
          <el-button type="primary" size="mini" v-bind:disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template> 
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
      >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item v-bind:label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改按钮的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
      >
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item v-bind:label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 存储商品分类列表数据
      catelist: [],
      // 级联选择器的配置对象
      cateProps: {
        expandTrigger: "hover", // 鼠标经过触发子菜单
        value: "cat_id", // 指定选择了哪个选项
        label: "cat_name", // 指定每个选项的名称
        children: "children", // 指定每个选项父子嵌套的数据源
      },
      // 级联选择框双向绑定到的数组,存储级联选择器选中的选项的ID
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: "many",
      manyTableData:[], // 动态参数的数据
      onlyTableData:[], // 静态属性的数据
      addDialogVisible: false, // 控制添加属性对话框显示与隐藏
      // 添加参数对话框的表单数据对象
      addForm:{
        attr_name:''
      },
      // 添加表单的验证规则对象
      addFormRules:{
        attr_name:[
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ]
      },
      // 控制修改对话框显示与隐藏
      editDialogVisible:false,
      // 修改对话框的表单数据对象
      editForm:{},
      // 修改对话框的表单验证规则
      editFormRules:{
        attr_name:[
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ]
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    // 获取所有商品分类列表
    async getCateList() { 
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      }
      this.catelist = res.data;
      console.log(this.catelist);
    },
    // 级联选择器选中项发生变化触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab页签点击事件
    handleTabClick() {
      console.log(this.activeName);
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 如果【存储级联选择器 选中的选项的ID】数组长度不等于3，就证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData= []
        return;
      }
      // 如果没有return出去就证明选中的是三级分类，那就需要把选中的分类数据获取过来
      console.log(this.selectedCateKeys);
      // 根据所选分类的ID，和当前所处的页签，获取对应的参数
      const {data:res} = await this.$http.get(`categories/${this.catId}/attributes`,{params:{sel:this.activeName}})
      if(res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败")
      }

      res.data.forEach((item)=>{
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本输入框的显示与隐藏，默认是隐藏
        item.inputVisible = false
        // 存储文本框中输入的值
        item.inputValue = ''
      })

      // 如果【被激活的页签的名称】等于【many】，那就动态参数的数据，就存在manyTableData数组
      if(this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        // 否则就是静态属性的数据，那就存在onlyTableData数组
        this.onlyTableData = res.data
      }

      console.log(res.data);
    },
    // 添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 添加对话框的确定事件
    addParams() {
      this.$refs.addFormRef.validate(async valid=>{
        if(!valid) return
        const {data:res} = await this.$http.post(`categories/${this.catId}/attributes`,{
          attr_name: this.addForm.attr_name,
          attr_sel:this.activeName
        })
        if(res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        } 
        this.$message.success('添加参数成功') 
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 修改按钮点击事件
    async showEditDialog(attr_id) {
      // 查询当前参数的信息
      const {data:res} = await this.$http.get(`categories/${this.catId}/attributes/${attr_id}`,{
        params:{attr_sel:this.activeName}
        })
        if(res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败')
        }
        this.editForm = res.data

      this.editDialogVisible = true
    }, 
    // 修改按钮关闭事件
    editDialogClosed() {
      // 重置修改对话框的表单
      this.$refs.editFormRef.resetFields()
    }, 
    // 修改按钮的确定键点击事件
    editParams() {
      this.$refs.editFormRef.validate(async valid=>{
        if(!valid) return
        const {data:res} = await this.$http.put(`categories/${this.catId}/attributes/${this.editForm.attr_id }`,{
          attr_name:this.editForm.attr_name,
          attr_sel:this.activeName,
        })
        if(res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getParamsData() // 刷新页面
        this.editDialogVisible = false  // 隐藏对话框
      })
    },
    // 删除按钮点击事件
    async removeParams(attr_id) {
       const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => {
          return err
        })
        // 用户取消了删除的操作
        if(confirmResult !== 'confirm') {
          return this.$message.info('已取消删除！')
        }

        // 删除的业务逻辑
        const {data:res} = await this.$http.delete(`categories/${this.catId}/attributes/${attr_id }`)
        if(res.meta.status!==200) {
          return this.$message.error("删除参数失败！")
        }
        this.$message.success("删除参数成功")
        this.getParamsData() // 刷线页面
    },
    // 文本框失去焦点或按下了Enter键都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return，则证明输入的内容需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false 
      // 需要发起请求保存这次操作
      this.saveAttrVals(row)
    },
    // 将对attr_vals的操作保存到数据
    async saveAttrVals(row) {
      const {data:res} = await this.$http.put(`categories/${this.catId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if(res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获取焦点
      this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    // 删除对应的参数可选项
    handleClose(index,row) {
      row.attr_vals.splice(index,1)
      this.saveAttrVals(row)
    }
  },
  computed:{
    // 如果按钮禁用则返回true，否则返回false
    isBtnDisabled() {
      if(this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类ID
    catId() {
      // 如果【存储级联选择器选中的选项的ID】数组的长度等于3，就证明选中了三级分类
      if(this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      // 如果长度不等于3，那就返回一个null，证明没有这个ID值
      return null
    },
    // 动态的添加参数对话框标题文本
    titleText() {
      if(this.activeName === 'many') {
        return '动态参数'
      } else{
        return '静态属性'
      }
    }
  }
};
</script>

<style lang="less" scoped>
* {
  margin: 0;
  padding: 0;
}
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>